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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (166,938)	$ (202,538)	$ (375,014)	$ (405,273)
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on available-for-sale investments	66	(405)	(563)	1,159
Foreign currency adjustment	0	0	0	25
Comprehensive loss, before tax	(166,872)	(202,943)	(375,577)	(404,089)
Income tax expense related to items of other comprehensive loss	0	0	170	0
Comprehensive loss, net of tax	$ (166,872)	$ (202,943)	$ (375,407)	$ (404,089)

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